package com.sap.mall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.rabbitmq.client.Channel;
import com.sap.common.to.OrderTo;
import com.sap.common.to.mq.StockDetailTo;
import com.sap.common.to.mq.StockLockedTo;
import com.sap.common.utils.R;
import com.sap.common.exception.NoStockException;
import com.sap.mall.ware.entity.WareOrderTaskDetailEntity;
import com.sap.mall.ware.entity.WareOrderTaskEntity;
import com.sap.mall.ware.feign.OrderFignServie;
import com.sap.mall.ware.feign.ProductFeignService;
import com.sap.mall.ware.service.WareOrderTaskDetailService;
import com.sap.mall.ware.service.WareOrderTaskService;
import com.sap.mall.ware.vo.OrderItemVo;
import com.sap.mall.ware.vo.OrderVo;
import com.sap.mall.ware.vo.SkuHasStockVo;
import com.sap.mall.ware.vo.WareSkuLockVo;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sap.common.utils.PageUtils;
import com.sap.common.utils.Query;

import com.sap.mall.ware.dao.WareSkuDao;
import com.sap.mall.ware.entity.WareSkuEntity;
import com.sap.mall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    OrderFignServie orderFignServie;

    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    WareOrderTaskService wareOrderTaskService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;


    /**
     * 1、库存自动解锁
     * 下订单成功，订单过期没有支付被系统自动取消，被用户手动取消，都要解锁库存
     * 订单失败
     * 由于锁库存失败
     * <p>
     * 只要解锁库存的消息失败，一定要告诉服务解锁失败。
     *
     * @param to
     */
    @Override
    public void unLockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        // 解锁
        // 查询数据库关于这个订单的锁定库存信息
        // 有： 证明库存锁定成功了，
        //      解锁：订单情况
        //          1、没有这个订单。   必须解锁
        //          2、有这个订单。    不是解锁库存
        //              订单状态: 已取消：解锁库存
        //                      没取消：不能解锁
        // 没有：库存锁定失败了，库存回滚了，这种情况无需解锁
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        if (byId != null) {
            // 解锁
            Long id = to.getId(); // 库存工作单的id;
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();   // 根据订单号查询订单的状态
            R r = orderFignServie.getOrdertStatus(orderSn);
            if (r.getCode() == 0) {
                OrderVo orderVo = r.getData(new TypeReference<OrderVo>() {
                });
                if (orderVo == null || orderVo.getStatus() == 4) {// 订单已经被取消了 才能解锁库存
                    if (byId.getLockStatus() == 1) { // 当前库存呢工作单详情 状态1，已锁定但是未解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                // 消息拒绝以后重新放到队列里面，让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
        } else {
            // 无需解锁
        }
    }

    /**
     * 防止订单服务卡顿，导致订单状态一直改不了，库存消息优先到期，查订单状态新建，什么都不错就走了，
     * 导致永远不能解锁库存
     *
     * @param orderTo
     */
    @Transactional
    @Override
    public void unLockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        // 查一下
        WareOrderTaskEntity taskEntity = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        // 按照工作单找到所有 没有解锁的库存 进行解锁
        List<WareOrderTaskDetailEntity> entities = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", taskEntity.getId())
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }
    }

    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        // 库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        // 更新库存共醉到的状态
        WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity();
        detailEntity.setId(taskDetailId);
        detailEntity.setLockStatus(2);// 变为已解锁
        wareOrderTaskDetailService.updateById(detailEntity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {

        /**
         * skuId:
         * wareId:
         */

        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Transactional
    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        // 1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities != null && entities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            // TODO: 1/12/2021  远程查询sku的名字，如果失败，整个事务无需回滚
            // 1、自己catch异常
            // TODO: 1/12/2021  还有别的方法让异常出现后不回滚，？ 事务的传播行为
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {
            }
            wareSkuDao.insert(wareSkuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo skuHasStockVo = new SkuHasStockVo();
            skuHasStockVo.setSkuId(skuId);
            Long count = wareSkuDao.getSkuStock(skuId);
            skuHasStockVo.setHasStock(count != null && count > 0);
            return skuHasStockVo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * 默认只要是运行时异常都会回滚
     *
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(taskEntity);

        // 1、按照下单的收获地址，找到一个就近仓库，锁定库存
        // 2、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            // 查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStocke(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        // 锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null && wareIds.size() == 0) {
                // 没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            // 1、如果每一个商品都锁定成功，当前商品锁定了几件的工作单记录发给mq
            // 2、锁定失败，前面保存的工作单信息就回滚了，发送出去的消息即使要解锁记录，由于去数据库查不到id，所以就不用
            for (Long wareId : wareIds) {
                // 成功就返回1否则0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    //
                    skuStocked = true;
                    // TODO: 3/9/2021 告诉mq 库存锁定成功
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(detailEntity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(detailEntity, stockDetailTo);
                    // 只发id不行，防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    // 当前仓库锁失败，尝试下一个仓库
                }
            }
            if (skuStocked == false) {
                // 当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        // 肯定全部都是锁定成功
        return true;
    }


    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}